#### Answer

$x=1.5,11.5$

#### Work Step by Step

When taking the square root of a number, you get a positive and a negative answer.
$2.5(x-6.5)^2-20=42.5$
$2.5(x-6.5)^2=62.5$
$(x-6.5)^2=25$
$x-6.5=5$
$x=11.5$
or
$x-6.5=-5$
$x=1.5$.
So
$x=1.5,11.5$.

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

$x=1.5,11.5$

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